Optimum Design of Launching Nose during Incremental Launching Construction of Same-Span Continuous Bridge

Authors: Weifeng Wang, Hengbin Zheng, Xianwei Zeng

Abstract:

The launching nose plays an important role in the incremental launching construction. The parameters of the launching nose essentially affect the internal forces of the girder during the construction. The appropriate parameters can decrease the internal forces in the girder and save the material and reduce the cost. The simplified structural model, which is made with displacement method according to the characteristic of incremental launching construction and the variation rule of the internal forces, calculates and analyzes the effect of the length, the rigidity and weight of launch nose on the internal forces of girder during the incremental launching construction. The method, which can calculate the launching nose parameters for the optimum incremental launching construction, is achieved. This method is simple, reliable and easy for practical use.

Keywords: incremental launching, launching nose, optimumanalysis, displacement method

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1075298

References:

[1] H. X. Yang, and X. L. Chen, "The maturation of the incremental launching technology of pre-stress concrete continuous bridge," Highway, Mar 2001, no. 3, pp. 10-13. (in Chinese)
[2] X. D. Zhang, "The incremental launching technology of bridge," Highway, Sep 2003, no. 9, pp. 45-51. (in Chinese)
[3] N. J. Beaney, and J. M. Martin, "Design and construction of the Dornoch Firth Bridge, construction," Proceedings of Institution Civil Engineering: Transportation, Vol. 100, pp. 145-156, Aug. 1993.
[4] M. Rosignoli, "Pre-stressing schemes for incrementally launched bridges," Journal of Bridge Engineering, May 1999, pp. 107-115.
[5] S. G. Xing, "A new idea about incremental launching technology of continuous bridge," Northeast Highway, 1994, no.4, pp. 71-82. (in Chinese)
[6] S. A. Liu, "Structural analysis and construction design of pre-stressed concrete continuous beam at construction stage," Journal of Shijiazhuang Railway Institute, Sep. 1998, no. 18 (suppl.), pp. 1-5. (in Chinese)
[7] A. B. Liang, C. S. Wang, and Y. Xu, "Use the application of MATLAB to programming for the compute program of continuous girder bridge by incremental launching," Traffic and Computer, vol. 18, no. 5, pp. 57-61, 2000. (in Chinese)
[8] Q. J. Tian, and X. L. Chen, "The use and the optimization of moor means of the nose-deck of the incremental lounching," Journal of China and Forign Highway, 2003, no. 6, pp. 38-40. (in Chinese)
[9] Y. Q. Long, and S. H. Bao, Structural Mechanics. Beijing: Higher Education Press, 1996. (in Chinese)
[10] J. S. Tang, "Review and prospect for incremental launching technique for pre-tressed concrete girder," Bridge Construction, 1996, no.1, pp. 11-14. (in Chinese)